Centering device for



Patented June 16A. 1863.

1. A.' TALPEY.

Centerng Device for Lathes.

UNITED STATES JOSEPH 'A. TALPEY, OF SOMERVILLE, MASSAOHUSETTS.-

CENTERING DEVICE FOR LATHES.

Specification forming part of Letters Patent No. 38,922, dated June 16,1863.

To all whom it may concern:

Be it known that I, JOSEPH A. TALPEY, of Somerville, in the county ofMiddlesex and State of Massachusetts, have invented a neT and ImprovedDevice for Gentering Articles to be Turned in Lathes; and I do herebydeclare that the following` is a full, clear, and exact description ofthe same, reference being had to the accompanying drawings, making apart of this specication, in Which- Figure lis a side elevation of myinven tion 5 Fig. 2, a longitudinal section of the same, taken in theline x, Fig. l; Fig. 3, an end view of the same.

Similar letters of reference indicate correspending parts in the severaltigures.

The object of this invention is to obtain. a simple and efficient devicefor expeditiously centering the ends of shafts and other articles Whichare to be turned in lathes.

The invention consists in the employment or use of a tube providedexternally with three or more pivoted arms and a conical slide, andhaving tted Within it a punch with a spring applied to it, the Wholebeing so arranged and organized that-by simply applying the end of thetube to the end ot the article to be centered, and shoving the conicalslide on the tube, the arms Will grasp the article to be turned andadjust the tube to the center of the article, which is centered bydriving the punch into the end of the shaft.

To enable those skilled in the art to fully understand and construct myinvention, I will proceed to describe it.

A represents atube, in which a punch, B,

`is tted. The punch is formed of a cylindrical rod of such a diameter asto t snugly Within the tube and still slide freely in it. One end, a.,of the punch is made conical to form a point, and the opposite end isprovided with a head, b, between which and the end of the tube A, aspiral spring, C, is fitted, said spring being on the punch. (See Fig.2.) The punch has a pin, c, projecting from it at right angles, and thispin extends through an oblong slot, cl, in the tube A. The spring C hasa tendency to keep the point a of the punch B Within the tube A, and thepin c against the inner end of the slot d, the latter serving to limitthe inward movement of the point a Within the tube A. On the tube Athere is fitted a collar, D, having ears e projecting from it, in whicharms E are secured by pivots or pinsf. These arms E at one end arecurved, as shown at g, and the opposite ends are beveled at their innersides, as shown at h. Each arm E has a spiral spring, t', connected toit, and these springs have a Vtendency to keep the curved ends g of thearms E out from the tube A. On the tube A there is tted a conical slide,F, the use of which will be presently seen.

The device is used as follows The tube A, at the end which is oppositethe curved ends g ofthe arms E, is placed against the end ofthe articleto be centered, and the sliding cone F is shoved along on the tube AandWithin the ends h of the arms, which causes the curved ends g ofthe armsto press against the article to be centered, (shown in redin Fig. 2,)and the arms will adjust the tube A in line with the center of thearticle to which it is applied. The punch B is then struck on its head bby a hammer or mallet and the point a Will form a center-mark in the endof the Work or article to be turned. After the blow hasv been given thepunch, and the center-mark made, the spring C throws the point a of thepunch within the tube A. The whole Work is done by a single operation ina moment of time, and accurately done.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

TheV tube A, punch B, arms E, and conical slide F, all combined andarranged to operate substantially as and for the purpose herein setforth.

JOS. A. TALPEY.

Witnesses:

FRANcTs RUSSELL, BENJ. S. MUNROE.

